<?php

/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019/8/22
 * Time: 16:17
 */
class 读取和保存base64编码的图片内容
{

}
header('Content-type:text/html;charset=utf-8');
//读取图片文件，转换成base64编码格式
$image_file = './4296762_165319032930_2.jpg';
$image_info = getimagesize($image_file);
$base64_image_content = "data:{$image_info['mime']};base64," . chunk_split(base64_encode(file_get_contents($image_file)));

//保存base64字符串为图片
//匹配出图片的格式
if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $base64_image_content, $result)){
    $type = $result[2];
    $new_file = "./test.{$type}";
    if (file_put_contents($new_file, base64_decode(str_replace($result[1], '', $base64_image_content)))){
        echo '新文件保存成功：', $new_file;
    }

}